Lumbar Plexus

Question 1

What forms the Lumbar plexus

Answer 1

Anterior primary rami of L1-L3 and part of L4. Some contribution from T12 via communication with L1

Question 2

What n. travels ant. and inf. between the QL and kidney through the transverse abdominal m. giving off a lateral cutaneous branch

Answer 2

Iliohypogastric

Question 3

What does the lateral cutaneous branch supply

Answer 3

The posterolateral gluteal region

Question 4

What branch of the iliohypogastric n. supplies the skin of the pubic region

Answer 4

Anterior Cutaneous branch

Question 5

What 2 m. does the iliohypogastric n. supply

Answer 5

Internal oblique

Transversus abdominus

Question 6

What n. follows a similar path to the iliohypogastric n. and travels with the spermatic cord (males) or round lig. (females)

Answer 6

Ilioinguinal

Question 7

What 2 m. does the ilioinguinal n. supply

Answer 7

Internal oblique

Transversus abdominus

Question 8

What m. does the genitofemoral n. pass through before it divides

Answer 8

Psoas major

Question 9

What n. gives motor supply to the cremaster and sensory to the skin of the sup. ant. scrotum

Answer 9

Genital branch of genitofemoral

Question 10

What n. supplies the skin of the mons pubis and labium majus

Answer 10

Genital branch of genitofemoral

Question 11

What n. supplies the skin of the upper anterior thigh

Answer 11

Femoral branch of genitofemoral

Question 12

Where are the only 2 places the femoral n. gives off branches

Answer 12

Abdomen and femoral triangle

Question 13

What do the branches from the abdominal part of the femoral n. supply

Answer 13

Iliacus and pectineus

Question 14

What happens to the femoral n. once it is beyond the inguinal ligament

Answer 14

Divides into ant. and post. divisions

Question 15

What are the 3 nerves of the anterior division of the femoral n.

Answer 15

Intermediate and medial cutaneous nerves of the thigh and Nerve to sartorius

Question 16

What n. does the intermediate cutaneous n. of the thigh communicate with

Answer 16

Femoral branch of the genitofemoral n.

Question 17

What n. does the medial cutaneous n. of the thigh communicate with

Answer 17

Saphenous n.

Question 18

What does the posterior division of the femoral n. give rise to

Answer 18

Muscular branches to quads
Vascular branches to femoral artery
Articular branches to knee

Question 19

What does the posterior division continue into the leg as

Answer 19

Saphenous n.

Question 20

What is the saphenous n. transmitted through

Answer 20

Adductor canal (travels with great saphenous vein in leg)

Question 21

What happens to the patellar reflex if the femoral n. is compromised

Answer 21

Decreased. (sensory deficits also may occur)

Question 22

What separates the ant. and post. branches of the obturator n.

Answer 22

Initially the obturator externus, then by adductor brevis

Question 23

What do the ant. branches of the obturator n. that communicate with branches of the femoral n. form

Answer 23

Subsartorial plexus

Question 24

The anterior branch of the obturator n. supplies what artery

Answer 24

Femoral

Question 25

What do articular branches of the obturator n. supply

Answer 25

Hip joint

Question 26

What 4 m. does the obturator n. supply

Answer 26

Adductor longus
Gracilis
Pectineus (also femoral n)
Adductor brevis

Question 27

What does the posterior branch of the obturator n. travel through

Answer 27

Obturator externus

Question 28

What 2 (poss 3) m. does the posterior branch of the obturator n. supply

Answer 28

Obturator externus and adductor magnus
Adductor brevis (if not supplied by ant. branch)